41 lines
1.4 KiB
JavaScript
41 lines
1.4 KiB
JavaScript
'use strict'
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/*
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Open Rowing Monitor, https://github.com/laberning/openrowingmonitor
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A simple Characteristic that gives read and notify access to a static value
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Currently also used as placeholder on a lot of characteristics that are not yet implemented properly
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*/
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import bleno from '@abandonware/bleno'
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import log from 'loglevel'
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export default class ValueReadCharacteristic extends bleno.Characteristic {
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constructor (uuid, value, description) {
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super({
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uuid: uuid,
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properties: ['read', 'notify'],
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value: null
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})
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this.uuid = uuid
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this._value = Buffer.isBuffer(value) ? value : Buffer.from(value)
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this._description = description
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this._updateValueCallback = null
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}
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onReadRequest (offset, callback) {
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log.debug(`ValueReadRequest: ${this._description ? this._description : this.uuid}`)
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callback(this.RESULT_SUCCESS, this._value.slice(offset, this._value.length))
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}
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onSubscribe (maxValueSize, updateValueCallback) {
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log.debug(`characteristic ${this._description ? this._description : this.uuid} - central subscribed with maxSize: ${maxValueSize}`)
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this._updateValueCallback = updateValueCallback
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return this.RESULT_SUCCESS
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}
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onUnsubscribe () {
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log.debug(`characteristic ${this._description ? this._description : this.uuid} - central unsubscribed`)
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this._updateValueCallback = null
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return this.RESULT_UNLIKELY_ERROR
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}
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}
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